Update README.md in preparation for archiving robotest

README.md

@@ -2,26 +2,5 @@
 
 Robotest is a tool for running automated integration tests against [Gravity](https://gravitational.com/gravity).
 
-# Running
-Robotest is distributed as a [Open Container Initiative](https://opencontainers.org/)
-image at https://quay.io/repository/gravitational/robotest-suite.
+Robotest is no longer developed or supported, as [Gravity has been deprecated](https://github.com/gravitational/gravity#gravity).
 
-To learn how to invoke `robotest-suite`, see the [suite README](./suite/README.md).
-
-# Upgrading
-To change to a different version of Robotest, simply depend on a different
-image tag from quay.io.
-
-## API Stability
-See Robotest's [release documentation](./RELEASE.md) for information about
-API stability and backwards compatibility between Robotest versions.
-
-# Contributing
-If you would like to contribute to Robotest, check out our [contribution guidelines](CONTRIBUTING.md).
-
-# End-to-End Testing (deprecated)
-In earlier versions, Robotest offered automated Web UI based tests against the
-Gravity web installer.  After [significant changes](https://github.com/gravitational/gravity/pull/424/)
-to the Web UI in Gravity 6.0 these browser based tests were never updated and
-have now fallen into disuse.  For more information on browser based tests see
-the [e2e README](./e2e/README.md).